Yeah, 155cm is incredibly short for the time. Like, there's a decent chance recruiting the crew for such a vehicle isn't possible within regulations.
Like, as a reminder, the British Army's minimum height standard in 1914 before the Great War was 160cm. Irmiones aren't that dramatically different in height from European norms, and like by the interwar period, 155cm was pretty close to the lower bound of what the IJA and IJN were recruiting. It's just too small, unergonomic and incredibly unsafe as a result.
There's three tanks that actually meet spec and those should absolutely be the ones that go forward.